/* Auxiliary program to test a DFA code path that cannot be triggered

   by grep or gawk.

   Copyright 2014-2017 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA

   02110-1301, USA.  */

#include <config.h>

#include <locale.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <regex.h>

#include <dfa.h>

#include <localeinfo.h>

#include "getprogname.h"

_Noreturn void

dfaerror (char const *mesg)

{

  printf ("dfaerror: %s\n", mesg);

  exit (EXIT_FAILURE);

}

_Noreturn void

dfawarn (char const *mesg)

{

  printf ("dfawarn: %s\n", mesg);

  exit (EXIT_FAILURE);

}

int

main (int argc, char **argv)

{

  struct dfa *dfa;

  char *beg, *end, *p;

  int allow_nl;

  struct localeinfo localeinfo;

  if (argc < 3)

    exit (EXIT_FAILURE);

  setlocale (LC_ALL, "");

  init_localeinfo (&localeinfo);

  dfa = dfaalloc ();

  dfasyntax (dfa, &localeinfo, RE_SYNTAX_GREP | RE_NO_EMPTY_RANGES, 0);

  dfacomp (argv[1], strlen (argv[1]), dfa, 0);

  beg = argv[2];

  end = argv[2] + strlen (argv[2]);

  allow_nl = argc > 3 && atoi (argv[3]);

  p = dfaexec (dfa, beg, end, allow_nl, NULL, NULL);

  if (p != NULL)

    printf ("%zd\n", p - beg);

  exit (EXIT_SUCCESS);

}